252 STALK-EYED CRUSTACEA 



articulation, with the sixth is at the expense of the 

 anterior border of the fifth segment, the antero-posterior 

 depth of the fifth being much less than that of its 

 margins ; the seventh joint is small and oval, and is let 

 into a notch in the sixth segment to about the level of a 

 half its antero-posterior diameter. 



The colour of the carapace is a dirty yellow, with a 

 yellow green centre and anterior margin, the blending 

 of the two colours being gradual ; the legs are purple ; 

 the first pair of legs are also purple, but the purple is 

 only on the upper margin of the palm, the remaining 

 portion and the under surface of the body being a dirty 

 yellow. 



Range. — British Guiana, Surinam, Para, Bahia ; 

 plentiful along the banks of the Berbice River. 



2. Uca una. 



ilea 7ina Margrave, H. Milne Edwards, 



Seba, Latreille, Guerin. 



Linne. 



Cancer nca ] 



Cancer cordatiis ] 



Ocypoda cor data . . . Latreille. 



Gecarcinus uca . . . Lamarck. 



Resembles Uca cordata^ except the smooth sub- 

 orbital space is better defined ; the pterygostomian 

 regions round this smooth space is thickly covered with 

 equal-sized pearl-like tubercles. The entire inner surface 

 of the first pair of legs is spiny, that is, of the fourth and 

 fifth joints and of the palm of the hand and inner face of 

 the fingers. The under surface of the walking legs have 

 very few hairs, some of the joints none ; their terminal 

 joint is very short and subequal. The broadest part of 



